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Three-dimensional numerical simulation of internal tides that radiated from the Luzon Strait into the Western Pacific

刘昆  徐振华  尹宝树  
【摘要】:Recent satellite altimeter observations have indicated that internal tides(ITs) from the Luzon Strait(LS) propagate more than 2 500 km into the Western Pacific(WP). This study used a high-resolution three-dimensional numerical model to reproduce and examine the ITs radiation process. The propagation of diurnal and semidiurnal ITs showed dif ferent patterns and variations. Diurnal ITs with lower frequency were af fected more by the earth's rotation and they were bent more toward the equator than semidiurnal ITs. ITs phase speeds are functions of latitude and diurnal ITs showed greater distinctions of phase speeds during propagation. For M_2 ITs, the wavelength remained nearly unchanged but the beam width increased significantly during propagation away from the LS. For diurnal ITs(K_1 and O_1), the wavelength decreased noticeably with latitude, while the beam width varied little during propagation because of blocking by land. Baroclinic energy was also examined as a complement to satellite results reported by Zhao(2014). The magnitude of the generated baroclinic energy flux reduced remarkably within 300 km from the generation site but it then decayed slowly when propagating into abyssal sea. Baroclinic energy of diurnal ITs was found to dissipate at a slower rate than semidiurnal ITs along the main propagation path in the WP.

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